PHYWE Cobra4 Sensor-Unit Conductivity+ User manual

1
www.phywe.com, © All rights reserved 12632.00 / 4808
Operating instructions
Cobra4 Sensor-Unit Conductivity+,
Conductivity / Temperature Pt1000 12632.00
PHYWE Systeme GmbH & Co. KG
Robert-Bosch-Breite 10
D-37079 Göttingen
Phone [phone]
Fax [phone]
E-mail [e-mail]
Fig. 1: 12632.00 Cobra4 Sensor-Unit Conductivity+
The unit complies with
the corresponding EC
guidelines.
CONTENTS
1 SAFETY PRECAUTIONS
2 PURPOSE AND CHARACTERISTICS
3 FUNCTIONAL AND OPERATING ELEMENTS
3.1 Operating elements
3.2 Sensor interface
4 NOTES ON OPERATION
5 HANDLING
5.1 Putting into operation
5.2 Recording of conductivity values
5.3 Cleaning and care of conductivity measuring cells
5.4 Recording of temperatures
6 TECHNICAL SPECIFICATIONS
7 PARTS SUPPLIED
8 ACCESSORIES
8.1 Probes that can be directly connected
8.2 Probes needing an adapter for connection
8.3 Calibration solution for conductivity measuring cells
8.4 Storage of conductivity measuring cells
9 NOTES ON THE GUARANTEE
10 WASTE DISPOSAL
1 SAEFTY PRECAUTIONS
• Carefully read these operating instructions completely
before operating this instrument. This is necessary to
avoid damage to it, as well as for user-safety.
• Only use the instrument for the purpose for which it was
designed.
• Only use the instrument in dry rooms in which there is no
risk of explosion.
• Protect Cobra4 Sensor-Unit Conductivity+ from dust,
moisture and vapours. Use a slightly moist lint-free cloth
to clean the instrument. Do not use aggressive cleaning
agents or solvents.
• Take care that no liquid penetrates in through the hous-
ing openings, as such penetration would result in dam-
age to Cobra4 Sensor-Unit Conductivity+.
• Only use the experimental set-up for the purpose for
which it is intended.
• Do not open up the instrument.
• Only connect the data output of Cobra4 Sensor-Unit
Conductivity+ to the measured data recording instru-
ments specifically intended for it.
• The present-day state of software development makes it
impossible to guarantee that a product is free of faults.
PHYWE Systeme GmbH & Co. KG therefore does not
take on any liability for damages that occur during the
installation or the use of the instrument.

2
www.phywe.com, © All rights reserved 12632.00 / 4808
2 PURPOSE AND CHARACTERISTICS
The Cobra4 Sensor-Unit Conductivity+, Conductivity / Tem-
perature Pt1000 serves to measure conductivity values in
aqueous solutions as well as to measure their temperatures.
According to the type of application, this Cobra4 Sensor-Unit
can be connected to the following measured value recording
instruments for transmittance of measured values to them:
• a Cobra4 Wireless-Link (12601.00) for data transfer to a
computer by wireless,
• a Cobra4 USB-Link (12610.00) for data transfer to a com-
puter via a USB-cable,
• a handheld Cobra4 Mobile-Link instrument (12620.00 ).
The interface to a measured data recording instrument is at
the front of the Sensor-Unit, whereby a mechanically secure
click connection is ensured by the mushroom-shaped click-on
connector and a hole.
The Sensor-Unit is equipped with a five pin DIN socket
("MAB socket") for the connection of sensing units. A com-
bined conductivity-temperature electrode Pt1000 (13701.01)
with DIN plug ("MAB plug") is usually used for the measure-
ment of conductivity values. With this, the conductivity and
temperature of the test solution can be simultaneously meas-
ured.
An adapter for conductivity measuring cells with 4 mm
socket / DIN plug (13701.02) enables a conductivity measur-
ing cell with 4 mm plug (18151.02) or a Pt1000 temperature
probe with 4 mm plug (13702.01) to be connected to the
Sensor-Unit.
Should only temperature measurement be required, then a
temperature immersion probe of type Pt1000 with DIN plug can
be connected (12123.00). A list of sensors (conductivity,
temperature), that can be connected to this Sensor-Unit is
given in section 8 (Accessories).
3 FUNCTIONAL AND OPERATING ELEMENTS
3.1 Operating elements
Cobra4 Sensor-Unit Conductivity+, Conductivity / Tempera-
ture Pt1000 has no elements for manual operation. Operation
is carried out via the hand-held Cobra4-Mobile-Link or via the
computer when Cobra4-USB-Link or Cobra4-Wireless-Link
are used. Operation can be started as soon as connection
has been made between Cobra4 Sensor-Unit Conductivity+,
Conductivity / Temperature Pt1000 and one of the three
measured value recording instruments.
3.2 Sensor interface
The measured values for conductivity and temperature can
be read out from the Sensor-Unit at a maximum speed of 1
measurement per second (1 Hz). As for all other settings,
setting of the measurement frequency wanted for the re-
cording of measured values is made via the particular instru-
ment connected to record measured values.
4 NOTES ON OPERATION
This high-quality instrument fulfils all of the technical re-
quirements that are compiled in current EC guidelines. The
characteristics of this product qualify it for the CE mark.
This instrument is only to be put into operation under special-
ist supervision in a controlled electromagnetic environment in
research, educational and training facilities (schools, universi-
ties, institutes and laboratories).
This means that in such an environment, no mobile phones
etc. are to be used in the immediate vicinity. The individual
connecting leads are each not to be longer than 2 m.
The instrument can be so influenced by electrostatic charges
and other electromagnetic phenomena (HF, bursts, indirect
lightning discharges) that it no longer works within the given
specifications. Carry out the following measures to reduce or
eliminate the effect of such disturbance:
Ensure potential equalization at the PC (especially with Lap-
tops). Use screening. Do not operate high frequency emitters
(e.g. radio equipment or mobile radiotelephones) in the im-
mediate vicinity. When a total failure of the instrument occurs,
unplug it and plug it back in again for a reset.
5 HANDLING
This section describes how to use the Sensor-Unit and re-
cord force data. To avoid failure or improper operation,
please read carefully through this section.
5.1 Putting into operation
Please make sure that the current version of measure is in-
stalled on your PC.
Download free of charge via:
www.phywe.com … software … measure
measure main program
measure module Cobra4
Alternatively, the software update can be performed with the
measure DVD.
Connect your Cobra4 Sensor-Unit Conductivity+, Conductiv-
ity / Temperature Pt1000 to one of the three possible meas-
ured value recording instruments via the 15-pin plug connec-
tor. Connect a conductivity-temperature probe Pt1000
(13701.01) or a temperature probe (12123.00) to the six pin
DIN socket of the Sensor-Unit. The Cobra4 Sensor-Unit is
then immediately ready to start as the connected measure-
ment recording instrument supplies the required voltage.
More detailed information on the steering of measured value
recording is given in the operating Instructions supplied with
the measured value recording instruments Mobile-Link, USB-
Link and Wireless-Link.
5.2 Recording of conductivity values
To measure the conductivity of a test solution, dip the meas-
uring head of the conductivity measuring cell completely into
the solution. For measurements on a series of solutions, start
with the one that has the lowest conductivity if possible. The-
re is always a certain carry-over of solution from one test
solution to the next, so that this procedure keeps possible
errors to an acceptable amount, as the carrying over of a
trace of a weakly conducting solution to a more strongly con-
ducting solution leads to a smaller relative error than the
other way round.
In each case, on changing from one solution to the next, the
measuring head and the electrodes must be rinsed with pure
water (demineralized or distilled).
When absolute conductivity values are to be recorded, then
the cell constant of the probe must be previously determined
using a calibration solution of known conductivity (e.g. with
calibration solution 1413 µS/cm (25°C), (47070.02)). The
value of this cell constant is then to be entered in the appro-
priate position in the measurement recording instrument. The
value of the temperature coefficient of the solution to be
measured should also to be entered there and temperature
compensation is to be triggered there. If a conductivity meas-
uring cell with integrated temperature sensor (e.g. 13701.01)
is used, temperature compensation of the measured values
can be made automatically by activating the appropriate func-

3
www.phywe.com, © All rights reserved 12632.00 / 4808
tion on the measured data recording instrument
The solution to be measured should always be moving a little
during measurement. Keep it in motion by stirring it with a
magnetic stirrer or similar, or by carefully moving the meas-
uring probe to and fro.
If a measuring cell other than the conductivity-temperature
probe Pt1000 (13701.01) is used, then this can be connected
to the Sensor-Unit by means of an adapter for conductivity
measuring cells with DIN plug and 4 mm sockets (13701.02).
The adapter has two 4 mm sockets for connecting conductiv-
ity measuring cells and two 4 mm sockets for connecting
Pt1000 temperature sensors. This assumes, however, that
the conductivity measuring cell and the temperature probe
are each equipped with two 4 mm plugs.
5.3 Cleaning and care of conductivity measuring cells
Conductivity measuring cells do not normally age but,
according to the electrode material, the measurement elec-
trodes could possibly be attacked during measurement in
certain media (e.g. strong acids, and bases) and this could
lead to damage to them. All measuring cells should therefore
be thoroughly rinsed with pure water (demineralized or dis-
tilled) after each usage. Should the measurement electrodes
become contaminated with grease or oil, then the measuring
cell is to be cleaned with warm water and a household clean-
ing agent.
Measuring cells with platinum-clad platinum electrodes, such
as conductivity-temperature probe Pt1000 (13701.01), are
supplied with a protective cap that is filled with distilled water.
These measuring cells must not be allowed to dry out, as it
could then come to a crumbling off platinum black, which
would lead to a change in the cell constant. They must there-
fore always be stored in clean water, e.g. in a protection
sleeve for electrodes, GL 25/12 (37651.15). Do not expose
the measurement electrodes to any mechanical measures
during cleaning of the platinized measuring cell.
5.4 Recording of temperatures
This Sensor-Unit can measure temperature as well as con-
ductivity.
Conductivity-temperature probe Pt1000 (13701.01) has a
Pt1000 temperature sensor integrated in the probe. As the
temperature sensor is inside the measuring head, there is a
short wait until temperature equalization has occurred be-
tween the medium and the temperature sensor, after which
the latter gives the correct temperature of the medium.
Should you want to only measure temperatures, without si-
multaneous recording of the conductivity, then a temperature
sensor with a DIN plug (12123.00), which has a stainless
steel jacket, can be used Because of its construction, this
sensor responds more quickly to temperature changes than
the conductivity-temperature probe Pt1000 (13701.01).
The selection of the measurement channel for temperature
is always made via the Mobile-Link, USB-Link or Wireless-
Link measured value recording instrument.
6 TECHNICAL SPECIFICATIONS
(Typical for 25°C)
Operating temperature range 5... 40°C
Relative humidity < 80%
Conductivity:
The Sensor-Unit has 3 measuring ranges for conductivity.
Selection of a range is made via the instrument connected for
measured value recording:
Measuring range 1 0.0...2500 µS/cm
Resolution 0.1 µS/cm
Measurement accuracy± 4% of measured value ± 0.15 µS/cm
Measuring range 2 0,0...45000 µS/cm
Resolution 1 µS/cm
Measurement accuracy ± 4% of measured value ± 3 µS/cm
Measuring range 3 0,0...1000 mS/cm
Resolution 0.01 mS/cm
Measurement accuracy± 4% of measured value ± 0.05 mS/cm
Data rate 1 Hz
Temperature:
Measuring range -20...+150°C
Resolution 0,1 K
Measurement accuracy ± 0.5 K
(in the range 0...+100°C)
Data rate 1 Hz
Dimensions:
Housing dimensions (mm) approx. 60 x 70 x 30
Weight 65 g
7 PARTS SUPPLIED
The extent of delivery is as follows:
• Cobra4 Senor-Unit Conductivity+ 12632.00
• Operating Instructions
8 ACCESSORIES
8.1 Probes that can be directly connected
Conductivity-temperature electrode Pt1000,
DIN plug 13701.01
Temperature immersion probe Pt1000,
stainless steel, DIN plug 12123.00
8.2 Probes needing an adapter for connection
Adapter for conductivity measuring cells
4 mm socket / DIN plug 13701.02
Conductivity measuring cell, l= 120 mm,
4 mm plug 18151.02
Temperature probe Pt1000, glass, 4 mm plug 13702.01
8.3 Calibration solution for conductivity measuring
cells
The following solution can be used for conductivity measuring
cell calibration:
Calibration solution 1413 µS/cm (25°C), 460 ml 47070.02
8.4 Storage of conductivity measuring cells
Protection sleeve for pH electrode, GL 25/12 37651.15

4
www.phywe.com, © All rights reserved 12632.00 / 4808
9 NOTES ON THE GUARANTEE
We guarantee the instrument supplied by us for a period of
24 months within the EU, or for 12 months outside of the EU.
Excepted from the guarantee are damages that result from
disregarding the Operating Instructions, from improper han-
dling of the instrument or from natural wear.
The manufacturer can only be held responsible for the func-
tion and technical safety characteristics of the instrument,
when maintenance, repairs and alterations to the instrument
are only carried out by the manufacturer or by personnel who
have been explicitly authorized by him to do so.
10 WASTE DISPOSAL
The packaging consists predominately of environmentally
compatible materials that can be passed on for disposal by
the local recycling service.
Should you no longer require this product,
do not dispose of it with the household
refuse.
Please return it to the address below for
proper waste disposal.
PHYWE Systeme GmbH & Co. KG
Abteilung Kundendienst (Customer Service)
Robert-Bosch-Breite 10
D-37079 Göttingen
Phone [phone]
Fax [phone]